为了提高新型高效紧凑式换热器设计的功能性，并使其满足热力学性能需求，对绕管的结构参数及桥接布管方式进行设计。采用一种新型的变径变线桥接方式，在体积有限的情况下实现密集的管束布置形式；对该新型换热器设计进行全尺寸流域建模及CFD数值模拟；并将三维建模结果与一维程序计算结果对比，进行可靠性验证。计算结果表明：三维计算的各项热力学性能结果与一维计算仅有较小偏差，总传热系数相对误差仅为3.74%，总传热量相对误差仅为1.04%，验证了该三维计算模型具有较好的准确性；结合温度云图证明了换热区域基本集中在绕管段，为简化复杂换热器的计算提供了思路；该新型高效紧凑式换热器设计实现了管侧双股流可独立运行且同层间不存在无效换热区，整体换热平顺进行，壳侧流阻较小，换热能力保持较好；在工况范围内整机换热体积功率达到4.67 MW。

In onder to improve the design function of the new efficient compact heat exchanger and meet its thermodynamic performance requirements, the structural parameters of the wound tube and the bridging arrangement method were designed. By employing a novel variable diameter and variable line bridging method, the dense arrangement of tube bundle was realized in the case of limited volume; the modeling of fullscale fluid field and the CFD simulation were carried out for the design of the new heat exchanger; and the reliability was verified by comparing the threedimensional modeling result and onedimensional procedure calculation result. The calculation results show that the thermodynamic performance of the threedimensional calculation has only a small deviation from the onedimensional calculation, with a relative error of only 3.74% for the total heat transfer coefficient and only 1.04% for the total transferring heat. This verifies the good accuracy of the threedimensional calculation model; at the same time, combined with the temperature cloud chart, it is proved that the heat exchange area is basically concentrated in the winding section, which provides a way to simplify the calculation of complex heat exchangers; the new efficient compact heat exchanger design realizes that the double stream flow at the tube side can operate independently, and there is no invalid heat exchange zone between the same layer. The overall heat transfer is smooth, with small flow resistance on the shell side and great heat transfer capacity maintained; the heat exchange volume power of the entire machine has reached 4.67 MW within the working conditions.

U664.5+3